13225428 has 36 divisors (see below), whose sum is σ = 34337940. Its totient is φ = 4288896.

The previous prime is 13225427. The next prime is 13225447. The reversal of 13225428 is 82452231.

13225428 is a `hidden beast` number, since 13 + 225 + 428 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7551504 + 5673924 = 2748^2 + 2382^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13225423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3633 + ... + 6296.

Almost surely, 2^13225428 is an apocalyptic number.

13225428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13225428 is an abundant number, since it is smaller than the sum of its proper divisors (21112512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13225428 is a wasteful number, since it uses less digits than its factorization.

13225428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9976 (or 9971 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 13225428 is about 3636.6781545801. The cubic root of 13225428 is about 236.4848072817.

Adding to 13225428 its reverse (82452231), we get a palindrome (95677659).

The spelling of 13225428 in words is "thirteen million, two hundred twenty-five thousand, four hundred twenty-eight".